Cheapest priced copy (Avacyn Restored): $0.35 at Card Kingdom, near mint, their price list as of .
Angel's Tomb 
Artifact · Uncommon · Innistrad Remastered · #253
Whenever a creature you control enters, you may have this artifact become a 3/3 white Angel artifact creature with flying until end of turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Avacyn Restored | 211 | Uncommon | $0.35 | $0.49 |
| Innistrad Remastered | 253 | Uncommon | $0.35 | $0.49 |
| Innistrad Remastered | 438 | Uncommon | $0.35 | $0.49 |
| Magic Origins | 222 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 22 June 2015If Angel’s Tomb is already a creature when a creature enters the battlefield under your control, its ability will override any effects that set its base power and toughness to specific values, but other changes to its power and toughness (such as the one created by Titanic Growth) will still apply.
- 22 June 2015Effects setting Angel’s Tomb’s base power and toughness to specific values that begin to apply after Angel’s Tomb has become a creature will override the effect of Angel’s Tomb. For example, if an effect causes a 3/3 Angel’s Tomb to become 0/1, it will remain 0/1 until another effect (such as triggering the ability of Angel’s Tomb a second time or targeting it with Titanic Growth) causes those values to change.